I had exactly the same thing happen (both with the installation at work and at home). You just need to quit out of the update (either shutdown the updater or if its unresponsive then end task from the task manager).

At work (newer rig and faster connection speeds) I ended up having to reset updater about 4 times.

At home (older rig and much slower connection) I needed to restart the updater about 9 times, especially near the end of the patching.

When it hangs for more than 2mins just restart.

I also had task manager up and was monitoring download speeds to help determine if it had glitched or not.